REFACTOR: Remove $.cookie in favor of a local library based on it (#10548)

This helps us out in a few ways:

1. It lessens our reliance on jQuery
2. It's slightly less code because it omits options we don't use
3. It is one less library to import and put into ES6 modules

vendor/assets/javascripts/jquery.cookie.js

@@ -1,117 +0,0 @@
-/*!
- * jQuery Cookie Plugin v1.4.1
- * https://github.com/carhartl/jquery-cookie
- *
- * Copyright 2013 Klaus Hartl
- * Released under the MIT license
- */
-(function (factory) {
-	if (typeof define === 'function' && define.amd) {
-		// AMD
-		define(['jquery'], factory);
-	} else if (typeof exports === 'object') {
-		// CommonJS
-		factory(require('jquery'));
-	} else {
-		// Browser globals
-		factory(jQuery);
-	}
-}(function ($) {
-
-	var pluses = /\+/g;
-
-	function encode(s) {
-		return config.raw ? s : encodeURIComponent(s);
-	}
-
-	function decode(s) {
-		return config.raw ? s : decodeURIComponent(s);
-	}
-
-	function stringifyCookieValue(value) {
-		return encode(config.json ? JSON.stringify(value) : String(value));
-	}
-
-	function parseCookieValue(s) {
-		if (s.indexOf('"') === 0) {
-			// This is a quoted cookie as according to RFC2068, unescape...
-			s = s.slice(1, -1).replace(/\\"/g, '"').replace(/\\\\/g, '\\');
-		}
-
-		try {
-			// Replace server-side written pluses with spaces.
-			// If we can't decode the cookie, ignore it, it's unusable.
-			// If we can't parse the cookie, ignore it, it's unusable.
-			s = decodeURIComponent(s.replace(pluses, ' '));
-			return config.json ? JSON.parse(s) : s;
-		} catch(e) {}
-	}
-
-	function read(s, converter) {
-		var value = config.raw ? s : parseCookieValue(s);
-		return $.isFunction(converter) ? converter(value) : value;
-	}
-
-	var config = $.cookie = function (key, value, options) {
-
-		// Write
-
-		if (value !== undefined && !$.isFunction(value)) {
-			options = $.extend({}, config.defaults, options);
-
-			if (typeof options.expires === 'number') {
-				var days = options.expires, t = options.expires = new Date();
-				t.setTime(+t + days * 864e+5);
-			}
-
-			return (document.cookie = [
-				encode(key), '=', stringifyCookieValue(value),
-				options.expires ? '; expires=' + options.expires.toUTCString() : '', // use expires attribute, max-age is not supported by IE
-				options.path    ? '; path=' + options.path : '',
-				options.domain  ? '; domain=' + options.domain : '',
-				options.secure  ? '; secure' : ''
-			].join(''));
-		}
-
-		// Read
-
-		var result = key ? undefined : {};
-
-		// To prevent the for loop in the first place assign an empty array
-		// in case there are no cookies at all. Also prevents odd result when
-		// calling $.cookie().
-		var cookies = document.cookie ? document.cookie.split('; ') : [];
-
-		for (var i = 0, l = cookies.length; i < l; i++) {
-			var parts = cookies[i].split('=');
-			var name = decode(parts.shift());
-			var cookie = parts.join('=');
-
-			if (key && key === name) {
-				// If second argument (value) is a function it's a converter...
-				result = read(cookie, value);
-				break;
-			}
-
-			// Prevent storing a cookie that we couldn't decode.
-			if (!key && (cookie = read(cookie)) !== undefined) {
-				result[name] = cookie;
-			}
-		}
-
-		return result;
-	};
-
-	config.defaults = {};
-
-	$.removeCookie = function (key, options) {
-		if ($.cookie(key) === undefined) {
-			return false;
-		}
-
-		// Must not alter options, thus extending a fresh object...
-		$.cookie(key, '', $.extend({}, options, { expires: -1 }));
-		return !$.cookie(key);
-	};
-
-}));